Efficacy of the TELL language and literacy curriculum for preschoolers with developmental speech and/or language impairment

The purpose of this investigation was to examine the efficacy of a new preschool oral language and early literacy curriculum package (Teaching Early Literacy and Language [TELL]) for children with developmental speech and/or language impairment (DSLI) either as a primary (e.g., specific to speech and/or language) or secondary impairment (e.g., developmental delay that includes DSLI). Participants included 118 children (30 females, 88 males, M age = 53.58 months) with DLSI and their 29 preschool teachers. The design was a randomized controlled trial (RCT) with assignment to experimental versus contrast conditions at the classroom level. Teachers in TELL classes received formal training, in-class support, and mentoring to implement the curriculum. Dependent measures for the children included scores on the Clinical Evaluation of Language Fundamentals-Preschool 2nd edition (CELF-P2), the Phonological Awareness Literacy Screening for Preschool (PALS-PreK), the Renfrew Bus Story (BUS), and a receptive and expressive vocabulary measure developed for this investigation (VOCAB). Results indicated that when compared to the contrast group, children in the TELL condition demonstrated greater gains on the phonological awareness subtest of the CELF-P2, the sentence length score of the BUS, the letter sounds, beginning sound awareness, and rhyme awareness subtests of the PALS-PreK, and VOCAB. Results suggest that the TELL curriculum package has promise for promoting gains in early literacy and oral language skills in preschool children with DLSI.

Research highlights
► The efficacy of the TELL language and literacy curriculum was tested through a randomized controlled trial with preschool children presenting with developmental speech and/or language impairment (DSLI).
► Comparison of oral language skills of children enrolled in TELL curriculum classes with their DSLI peers in contrast classes revealed significant improvements in vocabulary and sentence complexity for children in the TELL classes.
► Comparison of phonological awareness skills of children receiving the TELL curriculum with their DSLI peers in contrast classes revealed significant improvements for children in the TELL classes.
► A significantly greater number of children in the TELL classes met spring benchmarks on the PALS-PreK than did children in the contrast classes.